#include <bits/stdc++.h>
using namespace std;
long long a,b,c,d,e,f,k;
long long ans; 
int main()
{
	scanf("%lld%lld%lld%lld%lld%lld%lld",&a,&b,&c,&d,&e,&f,&k);
	ans=max(floor(1.0*k/b)*a*c,floor(1.0*k/e)*d*f);
	printf("%lld",ans);
	return 0;
}